Chapter 12 Practice #1                                                            Name ____________________________________

 

Show your work, use the correct sig figs, and include the units. Answers in parenthesis.

1.      Calculate the number of moles of nitrogen dioxide (NO2) produced when 3.0 moles of oxygen are produced in the decomposition of nitric acid by light? (12 mol NO2)

4 HNO3 → 4 NO2 + 2 H2O + O2

 

 

 

2.      Calculate the number of moles of Na2CS3 produced from 0.60 moles of CS2 by the following reaction. (0.40 mol Na2CS3)

3 CS2 + 6 NaOH → 2 Na2CS3 + Na2CO3 + 3 H2O

 

 

 

3.      How many grams of Si3N4 can be produced from 0.46 moles of N2? (32 g Si3N4)

3 Si + 2 N2 → Si3N4

 

 

 

 

4.      How many moles of NO can be produced from 0.680 g of NH3 according to the following reaction?
(.0399 mol NO)

4 NH3 + 5 O2 → 4 NO + 6 H2O

 

 

 

5.      How many moles of SO2 are required to convert 6.8 g of H2S according to the following reaction?
(0.10 mol SO2)

2 H2S + SO2 → 3 S + 2 H2O

 

 

 

6.      How many grams of carbon is required to produce 0.460 moles of SiC?).(16.6 g C)

SiO2 + 3 C → SiC + 2 CO

 

 

 

7.      How many grams of HClO3 can be produced from 7.2 g of ClO2 according to the following reaction?
(7.5g HClO3)

6 ClO2 + 3 H2O → 5 HClO3 + HCl

 

 

 

8.      How many grams of H2O2 are required to react with 11 g of N2H4 according to the following reaction?
(82 g H2O2)

7 H2O2 + N2H4 → 2 HNO3 + 8 H2O

 

9.      Given the following equation: 2 KClO3 →2 KCl + 3 O2
How many moles of O2 can be produced by letting 12.00 moles of KClO3 react?

 

 

10.  Given the following equation: 2 K + Cl2 → 2 KCl
How many grams of KCl is produced from 2.50 g of K and excess Cl2

 

 

 

 

11.  Given the following equation: Na2O + H2O → 2 NaOH
How many grams of NaOH is produced from 1.20 x 102 grams of Na2O?

 

 

12.  Given the following equation: 8 Fe + S8 → 8 FeS
What mass of iron is needed to react with 16.0 grams of sulfur?

 

 

 

13.  The average human requires 120.0 grams of glucose (C6H12O6) per day. How many grams of CO2 (in the photosynthesis reaction) are required for this amount of glucose?

The photosynthetic reaction is: 6 CO2 + 6 H2O → C6H12O6 + 6 O2

 

 

 

 

14.  How many moles of nitrogen gas could be formed from 4.8 moles of nitroglycerin (C3H5O9N3 ) decomposing by the following reaction?

4 C3H5O9N3 (l) → 12 CO2(g) + 10 H2O(l) + 6 N2(g) + O2(g)

 

 

 

15.  For the balanced equation shown below, how many grams of O2 will be produced, if 44.0 grams of N2 are produced? 2N2O→2N2+O2

 

 

 

 

16.  If 63.2 g of lithium oxide is decomposed, how many grams of oxygen will be formed? (You will have to write your own equation.)